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Thread: Pump loses prime

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    Join Date
    Aug 2009
    Location
    Andover MA
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    19

    Pump loses prime

    Some observations:
    If I keep the pump running, it won't lose prime.
    If I shutdown the pump for several hour, it loses prime.
    There are lots of air in the filter, when I fill the water under the pump lid, all water goes to the filter.
    When the pump is running, I see lots bubbles out of return constantly.

    My system is relatively simple: skimmer->pump->DE filter->returns

    One possible problem I found is the glue-like sealant on top of the pump is not sealing anymore. What is the name of the sealant? Where to find?
    [attachment=1:26m21hk9]prime1.jpg[/attachment:26m21hk9]
    [attachment=0:26m21hk9]prime2.jpg[/attachment:26m21hk9]



    Another unrelated question, how to prime efficiently? I use a sump pump and connect the sump pump to skimmer line with a vacuum hose, because the hose doesn't fit on sump pump (garden hose connection), I need both hands to push them together. Then I need another person to turn on the sump pump, then run to turn on the pool pump. With current prime problem, last was a busy weekend.
    Attached Images Attached Images
    16 ft x 32 ft Rectangle 20k Gal, in ground, gunite plaster
    Hayward EC65 DE filter 68GPM, Hayward super pump 1HP, Merlin robot (similar to Aquabot, can't turn on, anyone can fix it?)
    Chemicals: BBB. Tayler K-2006 test kit. Located in Andover MA.

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
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    Apr 2007
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    SW Indiana
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    8,618

    Re: Pump loses prime

    The sealant is on the outlet side of the pump, which wouldn't give you bubbles or priming issues. You undoubtedly have an air leak somewhere before the pump impeller. It looks like your strainer basket lid or the housing has been repaired with something, and is a good candidate for the source of the leak.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3

    Join Date
    Aug 2009
    Location
    Andover MA
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    Re: Pump loses prime

    I repositioned the gasket under the pump lid, as well as the o-ring inside of the pipe union. Things seem better. The pump prime itself in 2 minutes.
    I still see bubble in the return, and there is 3 inch air pocket right under the pump lid. Once I shut down the pump, the air pocket slowly getting bigger, seems coming from the suction side tube.
    I suspect there is still small leak in the pipe union (the o-ring looks old, I can't find a replacement in home depot), or one of the pipe connection right before pump.
    Is there a quick and easy way to check small leak around PVC pipes?
    16 ft x 32 ft Rectangle 20k Gal, in ground, gunite plaster
    Hayward EC65 DE filter 68GPM, Hayward super pump 1HP, Merlin robot (similar to Aquabot, can't turn on, anyone can fix it?)
    Chemicals: BBB. Tayler K-2006 test kit. Located in Andover MA.

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    Mod Squad JohnT's Avatar
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    Apr 2007
    Location
    SW Indiana
    Posts
    8,618

    Re: Pump loses prime

    Quote Originally Posted by sethz
    I suspect there is still small leak in the pipe union (the o-ring looks old, I can't find a replacement in home depot), or one of the pipe connection right before pump.
    Is there a quick and easy way to check small leak around PVC pipes?
    Suction side leaks sometimes spurt a little water when the pump shuts off. You can also try covering the are with the stream from a hose. This will temporarily stop air from getting in and the bubbles should disappear.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  5. Back To Top    #5

    Join Date
    Aug 2009
    Location
    Andover MA
    Posts
    19

    Re: Pump loses prime

    Quote Originally Posted by JohnT
    Suction side leaks sometimes spurt a little water when the pump shuts off. You can also try covering the are with the stream from a hose. This will temporarily stop air from getting in and the bubbles should disappear.
    Will look into, thanks John
    16 ft x 32 ft Rectangle 20k Gal, in ground, gunite plaster
    Hayward EC65 DE filter 68GPM, Hayward super pump 1HP, Merlin robot (similar to Aquabot, can't turn on, anyone can fix it?)
    Chemicals: BBB. Tayler K-2006 test kit. Located in Andover MA.

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